Limitations of using AR in tablets/Mobile devices?

Hello all,

I want to track large outdoor spaces like basketball court etc. Is it possible that my tablet or mobile device will be able to track the poles, bushes, nets etc.? Since I have seen AR used only in indoor and small spaces, I would like to know whether it has a space limit?
How close the user needs to stand near the real world objects for the device to detect it?

Possible solutions are welcome.

Thank you.